Can you think of any three-dimensional shape that comprises of exactly two surfaces?

Can you name three consecutive days without using the words Monday, Tuesday, Wednesday, Thursday, Friday, Saturday, or Sunday?

People put me on the table and cut me but do not eat me. What am I?

What is the word or phrase?

Find the hidden tiger in the given optical illusion ?

There are 2 sand hourglasses.

The small one can measure 5 hours and the large one can measure 7 hours.

How can we measure 16 hours with 2 sand hourglasses running together ?

What is so fragile that saying its name breaks it?

Samuel was out for a walk when it started to rain. He did not have an umbrella and he wasn't wearing a hat. His clothes were soaked, yet not a single hair on his head got wet. How could this happen?

I had an infinite supply of water and 5 litres and 3 litres jars.

How would you measure exactly 4 litres in the least number of steps?

When you say goodbye, I am what you need to tie.
I come as a couple and go wherever you run.
Who am I?